The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 507
wo condensers joinedacross each pair of inductance coils as shown, the action ofthese being as described on page 213. In other respects theconnections are similar to those illustrated in Fig. 243, as isalso the method of shunting in and out of operation of thesupervisory lamps. Cardiff Exchange… … THE BRITISH INSULATED CO.S EXCHANGES 479 The ultimate capacity of the boards is 10,000. The frameworkof the sections is strongly constructed of angle iron faced andfinished off at the front with polished mahogany. The cableshelves are of sheet iron, the one for the multiple cables com-pletely…
Telephone
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